Mexican photojournalist Rubén Espinosa — who took a picture of the mayor of Veracruz Javier Duarte for the magazine Proceso — was tortured and killed on July 31, and his corpse was found along with four murdered women.

Marco Ugarte / AP

A photograph of murdered photojournalist Ruben Espinosa inside a funeral home before his wake begins in Mexico City, Monday, Aug. 3, 2015.

He had fled Veracruz fearing for his safety, after having received several threats, he said. Since 2011, 14 journalists have been murdered in the state of Veracruz, El País reported.

Lydia Cacho, Mexican journalist and spokesperson of the movement, wrote about the cover in her column published in the news site Aristegui Noticias.

"Because my fellow reporters shouldn't have disappeared or died, or suffered from persecution until their last days #WeWontBeSilenced," she wrote. "Because the last word on how the Mexican political system should be is not said yet, and nobody will censor us #WeWontBeSilenced."

Inside the paper ran a letter to Mexican President Enrique Peña Nieto demanding free press and human rights, with signatures from more than 600 intellectuals and journalists from 192 different countries.

Avaaz

“When a journalist is attacked the entire society's right to information is violated,” reads the letter, which was endorsed by famous names like Salman Rushdie, Alfonso Cuarón, and Noam Chomsky.

Avaaz

“This crime is a benchmark,” it continues, and then declares Mexico as “one of the least safe places to practice journalism.”

Avaaz

“The National Commission of Human Rights (CNDH) has exhibited evidence involving public officials in several of the attacks to journalists and the media.”

Avaaz

People around the world are posting selfies on Twitter tagged with #NoNosCallarán showing their support. Here's a small sample: